Sound transmitter and receiver.



'PAT NTBD AUG. 23, 1904,

A. J. MUND'YY. sown TRANSMITTER AND RECEIVER.

{JPLIOATION' TILED APR. 23, 1902.

:10 MODEL.

- UNIT-ED STAras;

Patented- August PATENT Oran ARTHUR J. MUNDY, or Bos'ToN, iiissaouusn'rraassienoaTc SIGNAL COMPANYi OF VVAT-ERVILLE, MAINE, A-QORP OF Mama.

sounb TRANSMITTER ANo RECEIVER...

SPECIFICATION forming part of Letters Patent No! 768,568 dated August 28,

A umnn filedAprll'iS, 1902. Serial Hp- 104391. (3011104101.)

To all whom it may concern:

Be it known that LABTH'UR J. MUNm a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of 5 Massachusetts, have invented a new and useful Improvement in Sound Receivers and Transmitters, of which the following is a full, clear, and exact description, reference being had to the accompanyingdrawings, forming'a p'artof 10 this specification, in explaining its nature.

My present invention is another embodiment of theinvention of my copending application Serial No. 104,299, said application being limited in accordance with the Patent I5 Oflice requirements to a broad invention and one embodiment thereof; The broad invention of my said copending application relates to a means for preserving a continuity of similar medium between a sending means and 20 the diaphragm of the receiving-transmitter,

while at the same time maintaining said transmitter inclosed from the outer water. The apeci ticembodiment of the invention set forth and claimed in said application is the use of a 25 ship or similar structure itself or a portion thereof as the inclosingcasing and the side of said ship or structure asthe protecting wall of such casing.

My present invention relates to a device 3 comprising a case or shell containing a medium similar in nature to the outer water and having suitably mounted therein atransmitter of a character to be presently described. The relative position of the receiver, the inclosed 3 5 medium, and the outer water is that disclosed and claimed in my aforesaid copending application, and, similarly, an object of my present device is to maintain a continuity of the transmitting medium between the sound-pro- 4 ducing means and the transmitter, to avoid the disadvantage of an exposure of the transmitter to the open sea. and to secure all the advantages inherent to a proper insulation of said diaphragms from the outer elemerits. 45. A further object of this invention is the liarly adapted to operate in conta inclosed liquid of the submerged In order to secure the reliable 0 an electrical transmitter, it is ac maintain the resistance-varying I from moisture. Otherwise prope insulation is not secured, and the al resistance-varying means may, [IN seriously impaired. It is equally however, in submarine signalingtl .phragm of the transmitter be in act with the transmitting medium itSl a'medium similar in nature therel invention, as will hereinafter ap; requirements have all been met.

duccd adev'ice in which the resistan means is hermetically sealed to the though the diaphragm itself acts this liquid. Thus it is observed phragm and the resistance-varying the one directly operates the oths each operates in the medium to whi adapted for the purposes of the The protecting and inclosing casin, preserve the transmitter from sucl might cause it to' leak, and thus b paired in its action, and also serve tain in contact with the diaphrag dium in which that diaphragm most operates. it is apparent that be electrical transmitter and liquid-l casing there exists a mutual adap cooperation.

One feature of my invention is a. p casing which is portable in natt adapted to be readily immersed in or withdrawn therefrom and may I in shallow water or in otherwise it places. In fact it may be used um cumstance-s-in which the unprotectet have heretofore been used, whilea time it presents many of the adva the shipboard arrangement speci forth in my aforesaid copending a;

It is adaptedfor use in connection wi production of an electrical transmitter pecul craftand structures of all sorts, an

Q I reases la rly for use at stationary signal-stations.

I l open at both ends, and it has tl desire to have it understood, however, that I threads sf (1, upon which the annul other features of this'application maybe used without this form of casingas, for example, in connection with a tank or casing against the wall of the ship, as described in my said 'corending apy'ilication.

Having thus set forth the objects of my in vention, lwili nowmore'specmcally describe an embodiment of the same, reference being had to. the accompanying drawings for an.

illustration thcreo I Figure 1 is a view in cross-sectional elevation of my apparatus in operative position. Fig. 2 is a cross sectional view of the inclos-' ing or protecting casing.

In the figures the casing is indicated by the vreference-letter X. This casing is shown as a hollow sphere. A casing of such asbape has many advantages in actual use.-- It offers little resistance to moving water, and presenting a similar fate in all directions is not likely to be turned or twisted on its support by tides and currents. Its supporting connections are therefore not likely to be injured; The casing is shown in three sections or segments, the central of which is indicated in the drawings 'at .2 and is mounted upon the sup port or suspension 3 which is shown as tubular for the passage of the receiving-wires. The point of junction of the segment and the tube 1/ is made water-tight in any suitable way. At the ends of the segment rc are pro-- vided internal annular flanges m :12. These flanges are each internally screw-threaded. The segments a" and m are shown as provided withinternal annular flanges m and 11', re spectively, and the flanges m w are soshaped and threaded as to be adapted to engage the threaded fiauges m and a" to complete the casing. Vi hen the segments are so engaged, they are adapted to fit closely and render the finished casing waterproof. As afurther seal to the outside water a waterproof packing may be inserted between, the opposing flanges.

The casine when assembled and ready for use is entirely or partially'filled with the liquid with which it is de'sired'the transmitter be in contact.

The particular form of electric transmitter and the manner of its mounting is largely dependent' upon the style ofcasing and' other circumstances of each case, the points to be regarded'in each instance being resistance-va: rying means'sealed to the liquid with which the diaphragm is in contact. In the drawings ,I have shown within the casing the transmitter A, mounted in any suitable way, as by means of the extension a. It may be of any suitable material, preferably glass or brass, and is shown in the form of a cylindrical shell a, having extending from one side an integral hollow neck a'-. The shell provides a continuous cylindrical chamber a,

a are arranged to be screwed. '1 serves to clamp the edge of a diaphi one end of the shell and the cap a the edge of thediaphragm B'- to the of the-shell. The diaphragms and suit-able packings'for forming wa joints when the transmitter is tc merged, the, diaphragms closing tht the cylindrical chamber and formia: tight ends ther to, theinterier of 1 her being preferably filled with air mospheric or any other desired pres: the drawings each diaphragm isre as having mounted upon it ameans ing electrical resistance bearing oppc tion to each other and which may be to come into contact with each othe diaphragms are yibrated. This re: be obtained in the original fitting of t mitters or may be secured by an at contactor mounted upon one to be 8A toward and from the other. Such a able contactor is aflforded by mean screw C, mounted in the transmittel threaded hole therein and so' that it i able to and from the transmitter C, sequently from and toward the tra C whereby a contact-between the t ters is secured and its degree varie contactor is useful where the carbonl mounted upon a diaphragm and has i support and is as efiective for a sing: mitter as for multiple transmitters plat to back, as represented in the drawii where so employed one adjustable c serves for both transmitters. The trai C comprises the diaphragm B, whicl by its edge,'and means for varying e resistance, which is mounted upon an by the diaph ragm. The transmitter (.3 same construction, and it will be nece specificallydescribe butone. VVhilean, for varying electrical resistance may ployed, 1 have shown a constructiol involves the use of a carbon button e ing the carbon plates 0 c' and the comr carbon 0 held between them. Thesi and the carbon are held in the chambe shel 0. The shell is upon the inner the diaphragm B and is attached the a central'stud c, which passes throug' in the diaphragm and receives a fasten: 0 upon its outer end, which screws the diaphragm and clamps it against upon the case. The case is closed b3 ph'ragm of mica. or other materialch a1 by a clamping-ring to the flange cof tl This inner diaphragm has mounted u outer side in the chamber an a metal l nut c, by which the carbon plate a is cl to the inner diaphragm c, the carbo1 havinga threaded stud or screw which through a hole in the inner diaphragm and screws into the head or not There is thus provided a carbon button or means for varymg electrical resistance, which iscarried solely by the main diaphragm and which is there-= fore vibrated by it..- The inner diaphragm and the not or head 0, which it carries, provide somuch inertia to be overcome by the main diaphragm.

vibrations thatit establishes what might be called an accordion-actuating efiectupon the means forvarying electrical resistance, doing away with the. limitations which would be imposed were the nut or head 0 rigidly secured to the shell 0. and providing the carhon-holder witha lifB and action which it is desirable that it should have for producingthe best electrical action when vibrated by the when the transmitter may come into contact with an abutmentsuch, for instance, as that established by the contactor C with an opposing surface. As the transmitter Cis of a similflP-SlZXUCbUIB and as it bears opposed relation to the transmitter C, it will be seenthat not only does each transmitter have the accordion action which I have mentioned, but two transmitters together have an additional accordion movement with relation to each other due to the vibrations of each transmitter, which also adds to the liveliness of the carbon button and the value and efiectiveness of the transmitter.

There are thus in the transmitter shown in the figures three accordion efiects obtained, one

individual to each transmitter and one in which both transmitters join.

The transmitters may be connected either in series or in multiple, and the two parts or branches of the receiver or either of them may be connected with the transmitters either in series or in multiple. In the figures the transmitters and receiver are shown connected in one series through the cups a and the contactors C 0. The circuit may be traced as "follows: by one of the conducting-wires to one of the contactors 0, through the corresponding transmitter c and cup 0 to diaphragm B, then by way of casing a to the diaphragm B, and t rough the other transmitter to the other cont :tor and wire. I prefer to use a primary circuit and dispense with the use of inductioncoils, and thus do away with loss of electric energy in transformation. Of course the wires wherever they pass through water arein- -snlated by any desirable means, and l have shown them as passing from the chamber a" through the hole in the neck a and also through.

the insulating s' eeve'or extension G, which is attached to the neck. From the sleeve (Jr the wires pass to-the receivers F and the battery D.

The diaphragms of the transmitters may be tuned to the dominant tone of the bell used in producing the sound signals or impulses or of any other signal-producing means. Each tioned inherent to the water-tight casin;

the casing is still an effective protection receiver against in ury, and the transm medium of course remains continuous. This effect is'heightened Having thus 'fully described my inve; I claim and desircto secure by LettersI of the United States 1. An electric sound-transmitting comprising a shell or case adapted to I( and transmit sound-vibrations. an el sound-transmitter contained in the sh case and electrically connected with ceiver, and an incompressible fluid me contained in the shell or case.

2. An electric sound-transmittingd comprising a shell or case adapted to re and transmit sound-vibrations, an el sound-transmitter contained in the shc case electrically connected with a receive having a diaphragm within the shell, an

incompressible, fluid medium contained 5 shell between it and the diaphragm.

' 3. A sound-transmitting device comp: ashell or case adapted to receive and trai sound-vibrations, an electric sound-tran ter contained in said shell or case, said tric transmitter comprising a water chamber a vibratory diaphragm closing same, electrical resistance varying n within said chamber and in operative rel to said diaphragm. and an incom pressiblc medium between said diaphragm and the of said shell or casing and in contact t' with.

4. Anelectricsound-transmittingdevk submarine signaling cumprisinga shell or adapted to receive and transmit sound v tions transmitted to it by water. an el-e sound-transmitter contained in the she case and electrically connected with a rece and'a fluid medium in the shell or case lar to that by which the shell or case is rounded and from which itreceives so vibrations.

5. An electric-sound-transmittingdevic submarine signaling comprising ashell or adapted to receive and transmit sound-vi tions transmitted to it by water, an ele sound-transmitter contained in the shell or and having vertically-disposed diaphrz facing in two directions, which transmit! shellor case and'with which the diaphragms are in contact.

' submarine signaling comprising'ashell or'case submarine signaling comprising a shell or case electricaliy connected with a'recei-v'er, and an incompressible, fiu'ld medium-contained 1n the 6. An electricsound-transmittingdevicefor submarine signaling comprisinga shell or case adapted to receive and transmit sound-vibrations transferred to it by water, an electric sound-transmitter contained in the shell or case and electrically connected with a receiver, and an incompressible, non-corrosive, fluid medium contained in the shell or'case.

7. An electric sound-transmitting device for adapted to receive and transmit sound -vibra-. tions transferred'by water, an electric soundtransmitter contained in the shell or case" and electrically connected with a receiver, and an incompressible, fluid medium contained in the shell or case and automatically changeable as to density to conform to the density of the enveloping water.

8 An electric sound-transmitting device for adapted to receive and transmit sound-vibrations transferred by water to it, an electric sound-transmitter contained in, the shell or case and electrically connected with-a receiver, and means connecting the chamber of'the shell with the outer water whereby it is caused to be filled with water of the same density as that of the water surrounding it..

9. A sound-transmitter having'a number of diaphragms, means for varying electrical resistance mounted upon. each, the mountings of said means being adapted to have a vibratory contact with each other.

10. In a sound-transmitter, a number of vibratory diaphragms, means for varying electrical resistance mounted upon each, the mountings of said means being adapted to have a vibratory contact with each other, and means for adjusting their contact relation.

11-. In a transmitter for submarine telephony, a case or shell having two openings on vertical planes in line with each other, a vibratory diaphragm at eachopening attached to the case, a means for varying electrical resistance supported by each diaphragm contained in a water-tight chamber and havinga vibratory contact with each other, a receiver and means for connecting the transmitter electrically with the receiver.

12. A sound transmitter having a diaphragm, means for varying electrical resistance mounted thereon and supported thereby, and an abutment lying in the path'of vibration of said means, adapted to make and break contact therewith upon an operation of the transmitter.

13. A sound-transmitter having a plurality of diaphragms, mounted to simultaneously re-' ceive the impact of sound-waves, a plurality of electrics:l-resistance-varying means mount- 1 reams i I,

ed thereon and having independentaci means whereby the operation of one resistance-varying means modifies hill tion of another of said means.

14:. A sound-transmitter having a p of diaphragms, mounted to'simulta'neo ceive the impactof sound-waves, a p of electrical resistance-varying means ed thereon, and means whereby the 0g of one of said resistance'varying mean fies the opcrationof'another of said said resistance-varying means being c ed in series with each other.

15. A sound-transmitter having a p.

of diaphragms, moun ted to simultaneo ceive the impact of sonnd 'waves, a" p of electrical 'resistance-varying means ed thereon and supported thereby, ant whereby the operation of one of said an e-varying means modifies the open another of said means.

16. A transmitter for submarine tel comprising a shell or case having two( openings, a vibratory diaphragm closi of said openings and forming a. watt wall to the chamber ot-the shell, a me varying electrical resistance for each vibratory diaphragmscontained in the tight chamber, eachof said means in op relation to its respective diaphragm; whereby the operation of one of said ance-varying means modifies the opera another of said means, a receiver, and

tric circuit connecting the transmitte the receiver. v

17. In a transmitter for submarine my a case or shell having two opeuin 'a vibratory diaphragm to close each or attached to the shell and forming a proof wall thereto, the outer surface of is in contact with the water, a means rying electrical resistance for each diap in the water-tight chamber, a IBCBiW an electric circuit connecting the trans:

- in series with each other and with the re 18. In a transmitter for submarine 1 ony, a case or shell of non-corrosive rial, cylindrical in form, havingacenti low neck and two openings on vertical in line with each other, a vibratory diap at each opening, caps for attaching tl phragms to the case or shell, 8. means rying' electrical resistance for each diap inoperative conjunction therewith, are and an electric circuit between the trans and the receiver.

19. In a sound-transmitter, a diap' resistancevarying means supported tl and operating during vibration of ti phragm by virtue of its own inertia, it bination with additional means for ope said resistance-varying means at interi intermittently during such vibration.

20. In a soundtransmitter, a diapl V and resistance-varying means s11 pported thereby, means for varying said resistance, fu means for varying said resistance, said named means operating only upon vibz of a certain amplitude.

. ARTHUR J. MUNII v Witnesses;

F. F. RAYMOND, 2d, J. M. Dom. 

